[LON-CAPA-users] Variable sig figs (not a range)

[Gerd Kortemeyer]

Hi,

I am afraid for this special kind of functionality, you will need to use <customresponse>, and do string operations to see if the format is correct.

- Gerd.

On Oct 2, 2012, at 9:11 AM, "Mills, Douglas G" <dmills at illinois.edu> wrote:

> Thank you Stefan. Yes, I've since come across the &roundto function which I
> should be able to use when setting my display answer to their accepted
> answer so that I'm then displaying the number of decimal places I should be.
> What that solution lacks is a way to demand that they enter the correct
> number of sig figs up front since the correct number could be 4 (as in
> 10.34) or 3 (as in 9.34). Specifying the range of 3,4 allows for both of
> those but also allows incorrectly for 9.343 and 10.3. There seems to be no
> way around that at the moment. And I haven't tried it yet but I'm guessing
> the &roundto function will take care of the 9.343 but clearly can't address
> the 10.3 situation if I'm rounding to 2 decimal places.
> 
> Thanks,
> Doug
> 
> 
> On 10/2/12 7:09 AM, "Stefan Bisitz" <st.bisitz at ostfalia.de> wrote:
> 
>> Not sure if this helps:
> The problem is internally parsed two times anyway.
>> This makes it 
> possible to allow access to the student's answer in the perl
>> script 
> block located before the response block from which the answer
>> comes.
> 
> Stefan Bisitz
> 
> 
> Am 27.09.2012 22:54 schrieb Mills, Douglas G:
>> Thanks
>> Mark. I was thinking about this, but unless the script can somehow be
>> placed
>> within the numerical response, I don't believe it can impact the
>> submission
>> of the answer because it seems to be that when an answer is
>> submitted, it is
>> evaluated and then the page reloads so any scripts in the
>> head of the
>> document are not evaluated until after the answer has been
>> evaluated. Is it
>> possible to insert a script in a numerical response
>> somewhat like the answer
>> block in a customresponse?
>> 
>> Doug
>> 
>> 
>> On 9/27/12 3:28 PM, "Lucas, Mark"
>> <lucasm at ohio.edu> wrote:
>> 
>>> Doug,
>>> 
>>> Can you create a variable for sig
>> figs?  You can set it to 3 when <10 and 4
>>> when >10.
>>> Place it as the
>> argument for the default option.
>>> 
>>> While I'm not totally sure this flies
>> (you want to check it out), I think it
>>> may work. You can
>>> set some other
>> parameters by variables.
>>> 
>>> Mark
>>> 
>>> On Sep 27, 2012, at 4:16 PM, Mills,
>> Douglas G wrote:
>>> 
>>>> HI All,
>>>> 
>>>> There may be an obvious way to do
>> this, but it¹s escaping me if so.  We want
>>>> students to enter masses they
>> are measuring in the lab to the hundredths
>>>> place, but we¹re in a range
>> where they could be dealing with numbers more or
>>>> less than 10, so 3 or 4
>> sig figs. I know we can accept a range of 3,4, but
>>>> ideally what we¹d
>> really like to do is to require answers to ³2f².  I know I
>>>> could do this
>> using a custom response, but before evaluating whether or not
>>>> it¹s worth
>> that effort, is there a way to do this using a numerical response?
>>>> 
>>>> 
>> Thanks as always,
>>>> 
>>>> Doug
>>>> 
>>>> Douglas Mills
>>>> Director of
>> Instructional Technologies
>>>> Department of Chemistry
>>>> University of
>> Illinois
>>>> dmills at illinois.edu
>>>> (217) 244-5739
>>>> 
>>>> 
>> _______________________________________________
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>> list
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>> 
>> 
>> Doug
>> 
>> 
>> Douglas Mills
>> Director of Instructional Technologies
>> Department of
>> Chemistry
>> University of Illinois
>> dmills at illinois.edu
>> (217)
>> 244-5739
>> 
>> 
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> 
> 
> Doug
> 
> Douglas Mills
> Director of Instructional Technologies
> Department of Chemistry
> University of Illinois
> dmills at illinois.edu
> (217) 244-5739 
> 
> 
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